Qatar Grand Prix winners Ducati have been placed under investigation by MotoGP race control, after four teams lodged a complaint against one of its aerodynamic devices.  Ducati introduced a spoiler extending from the swingarm of the GP19 during winter testing, with Danilo Petrucci running with it throughout the entire Qatar weekend, while race winner Andrea Dovizioso had it fitted on Sunday.  Following Dovizioso's second-successive Qatar win, which he beat Honda's Marc Marquez for by just 0.023 seconds, four manufacturers have made an official complaint against the legality of the device.  Aprilia, Honda, KTM and Suzuki raised the issue with Race Direction, who has...
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